Thermal Parameters Optimization Of The Cement Plant Kiln System

Cement production has the characteristics of high energy consumption, so ener-gy-saving and environmental protection is the key to sustainable development of ce-ment plant. Though cement production technology in China has reached internationalleading level, there is big different between each production line. Based on the prop-erty of excessive thermotechnical parameters and strong interaction in kiln system,analyzing from the statistics and simulation point, the method to reduce unit heatconsumption and improve the cement strength was explored, which provided operat-ing parameters.The Database was built based on one year production parameters in cement plant.The thermal consumption model and the strength mode were established by taking theunit heat consumption and clinker28-day strength as the objective, and using the me-thod of multivariate linear equation. The major parameters impact of heat consump-tion and strength were analyzed. Furthermore, based on the heat consumption modeland strength model, an optimization model was set up targeted to the minimum heatconsumption strength ratio, and the optimal solution was obtained. The decision treemodel was established by taking the unit heat consumption, clinker28-day strengthand heat consumption strength ratio as output, and the major factors and optimalrange were obtained. Separation efficiency and heat exchange efficiency in cyclonewas analyzed by self-developed counterclaim software.In the production line, the result shows that the main influencing factors for unitheat consumption and clinker28-day strength are lime saturation factor, head kilnfeeding coal ratio, calciner outlet temperature, C5blanking temperature and clinkerproduction. The besy control values are, the lime saturation factor is0.9, the head kilnfeeding coal ratio is45.23%, the calciner outlet temperature is880℃, the C5blankingtemperature is852℃, the clinker production is250t/h. The decision tree shows thatthe main influencing factors for unit heat consumption, clinker28-day and heat con-sumption strength ratio are clinker production, tertiary air temperature, head kilnfeeding coal ratio, calciner outlet temperature, kiln end temperature and C1negativepressure. The main influencing factor for separation efficiency and heat exchange ef-ficiency in C1is solid-gas ratio.